Chapter 1: Introduction Of Electronics Communication

Question 1

_________ is the process of exchanging information.

Answer 1

Communication

Question 2

Two main barriers are _______ and _______.

Answer 2

Language and distance

Question 3

_____ degrades or interferes with transmitted information.

Answer 3

Noise

Question 4

The ________ is a collection of electronic components and circuits that converts the electrical signal into a signal suitable for transmission over a given medium.

Answer 4

Transmitter

Question 5

The _______ channel is the medium by which the electronic signal is sent from one place to another.

Answer 5

Communication channel

Question 6

Water is the medium for _____.

Answer 6

Sonar

Question 7

A _________ is a collection of electronic components and circuits that accepts the transmitted message from the channel and converts it back into a form understandable by humans.

Answer 7

Receiver

Question 8

A electronic device incorporates circuits that both send and receive signals.

Answer 8

Transceiver

Question 9

Signal _______, or _______, exist in all media of wireless transmission. It is proportional to the square of the distance between the transmitter and receiver.

Answer 9

Attenuation or degradation

Question 10

The simplest method of electronic communication is referred to as _____. A one-way communication system.

Answer 10

Simplex

Question 11

Most electronic communication is two–way and is referred to as ______.

Answer 11

Duplex

Question 12

When people can talk and listen simultaneously it is called _________.

Answer 12

Full duplex

Question 13

The form of two-way communication in which only one party transmits at a time is known as _____.

Answer 13

Half duplex

Question 14

An ________ is a smoothly and continuously varying voltage or current.

Answer 14

Analog signal

Question 15

_______ signal change in steps or in discrete increments.

Answer 15

Digital

Question 16

_______ and __________ are electronics techniques for transmitting information efficiently from one place to another.

Answer 16

Modulation and multiplexing

Question 17

_________ makes the information signal more compatible with the medium.

Answer 17

Modulation

Question 18

________ allows more than one signal to be transmitted concurrently over a single medium.

Answer 18

Multiplexing

Question 19

________ information can be sent directly and unmodified over the medium or can be used to modulate a carrier for transmission over the medium.

Answer 19

Baseband

Question 20

A ___ is a high frequency signal that is modulated by audio, video, or data.

Answer 20

Carrier

Question 21

A ____ wave is an electromagnetic signal that is able to travel long distances through space.

Answer 21

Radio frequency

Question 22

A __________ takes place when a carrier signal is modulated, amplified, and sent to the antenna for transmission.

Answer 22

broadband transmission

Question 23

Three Methods of modulation are:

Answer 23

Amplitude modulation
Frequency modulation
Phase modulation

Question 24

__________ takes place when data is converted to frequency varying tones.

Answer 24

Frequency shift keying

Question 25

device called ______ translate the data from digital to analog and back again.

Answer 25

Modems

Question 26

_______ or detection takes place in the receiver when the original baseband signal is extracted.

Answer 26

Demodulation

Question 27

The range of electromagnetic signal encompassing all frequencies is referred to as the __________.

Answer 27

Electromagnetic spectrum

Question 28

Extremely Low Frequencies

Answer 28

30-300 Hz

Question 29

Voice Frequencies

Answer 29

300 - 3000 Hz

Question 30

Very Low Frequencies

Answer 30

3000 - 20kHz

Question 31

Low Frequencies

Answer 31

30-300 kHz

Question 32

Medium Frequencies

Answer 32

300-3000 kHz

Question 33

High Frequencies

Answer 33

3 -- 30 MHz

Question 34

Very High Frequencies

Answer 34

30 -300 MHz

Question 35

Ultra High Frequencies

Answer 35

300 3000 MHz

Question 36

Microwave

Answer 36

1-30 GHz

Question 37

Extremely High Frequencies

Answer 37

30 300 GHz

Question 38

The _________ exist directly above the millimeter wave region.

Answer 38

Optical spectrum

Question 39

___________ is that portion of the electromagnetic spectrum occupied by a signal.

Answer 39

Bandwidth

Question 40

_____________ refers to the range of frequencies required to transmit the desired information.

Answer 40

Channel bandwidth